<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        //1.绝对值方法
        console.log(Math.abs(1));
        console.log(Math.abs(-1));
        console.log(Math.abs('1'));//隐式转换 会把字符串型的 -1转换为数字型
        console.log(Math.abs('pink'));//NaN
        //2.三个取整方法
        //(1) Math.floor() 向下取值 往最小了取值
        console.log(Math.floor(1.1));//1
        console.log(Math.floor(1.9));//1
        //(2) Math.ceil 向上取整 往大了取
        console.log(Math.ceil(1.1));//2
        console.log(Math.ceil(1.9));//2
        //(3) Math.round() 四舍五入 其他数字都是四舍五入,但是 .5特殊 它往大了去
        console.log(Math.round(1.1));//1
        console.log(Math.round(1.5));//2
        console.log(Math.round(-1.1));//-1
        console.log(Math.round(-1.5));//-1 这个结果是-1
    </script>
</head>
<body>

</body>
</html>